Relief valve



Aug.- 31 1926.

W. L. MARDEN RELIEF VALVE Filed Jan. 25, 1926 Patented Aug. 31, 1926.

UNITED STATES PATENT OFFICE.

WILLIA L. MARDEN, or, NEW

YORK, 1v. Y.,

PANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

RELIEF VALVE.

Application filed January 23, 1926. Serial No. 83,221.

In Letters Patent of the United States No. 1,537,145, dated May 12, 1925, there is shown and described an improved relief valve, designed with special reference to its use in connection with domestic water-heat ing plants, to rovide automatic relief if the pressure within the wstem increases within a predetermined limit, as sometimes .happens if the normal return is choked in any way. To prevent possible waste of water, it is desirable, of course, that there shall be no leakage through. the valve unless the condition which requires the relief valves to function arises. lief valve referred to has shown that conditions may arise in which the valve does not close perfectly, and it is the object of the present invention to overcome this occasional difficulty and to improve the valve- 0 seating arrangement so that the valve shall close perfectly under all conditions. In an application of the resent applicant, Serial No. 16,881, filed arch 20, 1925, there was shown and described a valve-seating ar 5 rangement'which, at the time, was believed to satisfy the requirements of use, but practical use of that arrangement showed that it was not altogether satisfacory and resulted in the development of the present 80 invention, by which the requirements of use are met more satisfactorily and the cost of production, in quantity, is considerably reduced. In accordance with the invention, the stem which carries the weight has threaded on its end a head which is recessed to receive a disc-like valve plug, the inner end of the recess being coned so that when the valve closes the disc-like plug may rock agalnst the same and so conform tothe annular valve seat, the edge of the recess being crimped after the plug is in place so as to engage the plug, which is preferably beveled for the purpose, and to retain it.

The invention will be more fully explained hereinafter with reference to the accompanying drawing, the single figure of which presents a view in sectional elevation of a relief valve which embodies the invention.

The casing of the valve, preferably approximately spherical in form, consists of an upper member a and a lower member 6, provided respectively with lugs a and b for the reception of screws 0 by which the two members can be secured together. The upper Extensive use of-the remember has an axial boss at which is bored, as at a to form a guide for one end of a valve stem 0?. The lower member 6 has a threaded projection b for engagement with the supply pipe and with a wrench grip b connection is formed at Z) for the overflow pipe not shown. The bore of the pro- ]ectlon b is threaded as at b to receive the bored valve seat 9, preferably of Monel metal, formed'with a knife-edge for co-a'ction with the valve plug al also preferably formed of Monel metal and so carried by the valve stem 03 as to be easily secured in place and to be capable of rocking movement and therefore of conforming to the position of the valve seat 9 and to seat perfectly thereon. Forthis purpose there is threaded on the lower end ofthe valve stem (Z a head 0! which is recessed, as at df, the inner end of the recess being coned, as shown at 03 so that when the valve plug d is seated in the recessit shall be capable of rocking on the coned surface and therefore of conforming to the position of the valve seat. In order that the valve plug shall be retained in place, but with freedom for rocking, as described, the valve plugis beveled slightly, as at 01 and, after the valve plug has been placed in the recess, the edge of the recess is crimped slightly, as at d", so as to prevent the plug from falling out of the recess. This construction affords the desired freedom of ASSIGNOR 'IO NEPTUNE METER COM- movement for the valve plug, is not liable her 6 of the casing and is provided with a central opening, as ath, to form a guide for the lower end of the valve stem and with other openings 72, distributed about the central opening to give free vent to the in flowing water when the valve is unseated against the weight "91 which is carried by the valve stem I claim as my invention:

A relief valve comprising a casing to be' connected to a supply line and provided with a waste outlet, an annular valve seat carried by the casing, a weighted valve stem guided in the casing, a headsecured to the valve stem and formed at its lower extremity with a recess having a downwardly projecting the downwardly projectingcone but permitcone at its upper end and a frusto-conical ting the plug to be shifted angularly w1th metallic disc-like valve plug seated in the respect to the axis of the head. 10

recess of the head against the inwardly pro- This specification signed this 19th day of 5 jecting cone, the wall of the recess of the January A. D. 1926.

head being crimped about the conical side of the plug to retain the same in place against WILLIAM L. MARDEN. 

